CO2在1.57 μm光谱区31112-01101波段的离轴集成腔输出光谱研究

IF 1.3 4区物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Journal of Molecular Spectroscopy Pub Date : 2025-09-04 DOI:10.1016/j.jms.2025.112049

Ayan Kumar Pal , Naveen Kumar

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引用次数: 0

摘要

温室气体及其光谱参数的近红外实验研究在大气科学、天体物理学和气候变化研究领域有着广泛的应用。二氧化碳（CO2）是一种重要的温室气体，由于其在气候变化以及大气和天体物理科学中的关键作用，一直是各种光谱研究的主题。本文研究了CO2在1.57 μm光谱区31112-01101弱波段（f对称）的P支和r支的反振动谱线。研究采用高灵敏度离轴集成腔输出光谱（OA-ICOS）与连续波外腔二极管激光器（CW-ECDL）光源耦合进行。重点研究了热带P和r分支中各种无干扰谱线（8≤J≤28）的空气展宽系数（γair）、谱线强度和自展宽系数（γself）等重要光谱参数的实验测量。利用Voigt剖面函数对OA-ICOS吸收谱线进行建模，提取参数，准确再现了光谱噪声水平内的吸收谱线形状。将所得的γ - air与HITRAN2020中的经验值和CDSD中的理论值进行比较，平均差异分别约为3.20%和1.25%。将检索到的线强度和γself与先前报道的值进行比较，发现平均差异分别约为1.99%和1.34%。此外，还探讨了CO2-CO2和co2 -空气二元系统的旋转依赖性、Einstein-A21系数、有效碰撞直径和横截面。本研究获取的分子光谱参数将在大气科学、天体物理科学、气候变化研究等领域得到广泛应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Off-axis integrated cavity output spectroscopic study of 31112–01101 band of CO2 in 1.57 μm spectral region

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Off-axis integrated cavity output spectroscopic study of 31112–01101 band of CO2 in 1.57 μm spectral region

The near-infrared experimental investigation of greenhouse gases and their spectroscopic parameters finds a wide range of applications in the field of atmospheric science, astrophysics, and climate change research. Carbon dioxide (CO₂), an important greenhouse gas, has been the subject of various spectroscopic studies due to its pivotal role in climate change, as well as in the atmospheric and astrophysical sciences. In this study, we present the spectroscopic investigation of ro-vibrational lines of P- and R-branches of the weak 31112–01101 band (f-symmetry) of CO₂ lying in 1.57 μm spectral region. The study was carried out by high-sensitive off-axis integrated cavity output spectroscopy (OA-ICOS) coupled with a continuous wave-external cavity diode laser (CW-ECDL) source. The study focuses on the experimental measurement of vital spectroscopic parameters, such as air-broadening coefficients (γ_air), line intensities and self-broadening coefficients (γ_self) of various interference free lines (8 ≤ J ≤ 28) in the P- and R-branches of the hot band. The OA-ICOS absorption lines were modeled using the Voigt profile function to retrieve the parameters, which accurately reproduced the line shapes within the spectral noise level. The obtained γ_air were compared with empirical values present in HITRAN2020 and theoretical values in CDSD, showing mean discrepancies of about 3.20% and 1.25%, respectively. The retrieved line intensities and γ_self were also compared with previously reported values, revealing mean discrepancies of about 1.99% and 1.34%, respectively. Additionally, rotational dependency, the Einstein-A₂₁ coefficient, effective collision diameter and cross-sections for CO₂-CO₂ and CO₂-air binary systems have also been explored and presented. The molecular spectroscopic parameters retrieved in this study will find various applications in the field of atmospheric science, astrophysical science, and climate change research.

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来源期刊

Journal of Molecular Spectroscopy 物理-光谱学

CiteScore

2.70

自引率

21.40%

发文量

审稿时长

29 days

期刊介绍： The Journal of Molecular Spectroscopy presents experimental and theoretical articles on all subjects relevant to molecular spectroscopy and its modern applications. An international medium for the publication of some of the most significant research in the field, the Journal of Molecular Spectroscopy is an invaluable resource for astrophysicists, chemists, physicists, engineers, and others involved in molecular spectroscopy research and practice.